Dust-collector



2 Sheets--Sheet 1 (No Model.)

A H. KBISBR.. DUST COLLECTOR.

Patented 1360.9, 1884.

WINBSSES 1 INVENTOR.

` W 9 .gk j/ZZTRNEY N. Pinzas. Phowummpm washmgm n.0.

(Na Model.) I 2 Sheets-Sheet 2.

H. KEISER. DUST GOLLEGTOR.

No. 308,898. PatentedV-Deopg, 1884.

WITNESSES: INVBNTOR.

EMTTORNEY UMTED STATES PATENT OFFICEo I HENRY KEISER, OF BLOOMINGTON, ILLINOIS.

DUST-COLLECTOR.

E51?ECIFIC ATON forming part of Letters Patent No. 308,898, dated December 9, 1884.

Application filed April 15, 1884. (No model.)

T @ZZ whom it may concern:

Be it known that I, HENRY KEIsER, of

Bloomington, in the county of McLean, and in the State of Illinois, have invented certain new and useful Improvements in Dust-Collectors; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon, making a part of this specification. This invention relates to that class of milling machinery known as dust-collectors;77 and it has for its object to provide simple mechanism for automatically supplying and cutting off an air-blast to the dust-chambers, for the purpose hereinafter described; and this result I accomplish by the means and in the manner hereinafter fully described and claimed, due reference being had to the accompanying drawings, forming part of this specification, wherein- Figure 1 is a broken sectional elevation of two dust-chambers placed one above the other 5 Fig. 2, a'horizontal plane taken on the line ma of Fig. l, and Fig. 3 an enlarged view of the valve for deflecting the air-blast from one chamber to the other and the means for operating the same; Fig. 4, a detailed sectional view of one of the knocker-arms and one of the inclined blocks or cams it engages with iu its revolutions.

In flour-mills dust and ne flour are constantly being thrown off from the bolts and millstones into the atmosphere, which not only renders the air unhealthy, but also deposits the dust upon the journals and running parts of the machinery,- tending to choke the same; and the accumulation of dust in time in creases the danger of iire, which is always more or less imminent in mills of this and other classes. Various dust-collectors have been devised to obviate this disadvantage, with more or less success, and the present invention is designed to effectually accomplish this result in the manner and by the means hereinafter described.

Referring to the drawings, the letters A A indicatetwo dust-chambers placed one above the other. These dust-chambers are preferably constructed of circular form in cross-section,

andare provided with a series of frames, over which` are stretched cloth in such manner that as the air is forced through them the dust will be arrested and held by the cloths. These frames are of such well-known construction that no special description of the same will be needed. The lower dust-chamber, A, is provided with a central air-passage, B, extending vertically through the center of the same and communicating at its lower end with the cloth-frames of said dust-chamber A, and at its upper end with the dust-chamber A.

C indicates the air-trunk for conveying the air being forcedthrough the same by a fan, or by any of the well-known means employed for the purpose in this class of machinery, -said air-trunk being connected with and discharging into the central air-passage, B, as shown.

D indicates a shaft extending up vertically through the center of both the dust-chambers A and A', said shaft being rotated by connecting the same by suitable gearing with any portion of theI milling machinery.

E indicates scraper-arms, rigidly mounted upon said shaft D, and revolving with ascraping action upon the bottoms of the dust-cham bers A A', sweeping the accumulated dust out through openings e, whence it is conveyed by a suitable hopper or troughs to bins or other receptacles designed to receive the dust.

F indicates knocker arms mounted upon said scraper-arms E,and provided upon their extremities with rollers f, which come in contact with inclined blocks or cams c e', as shown in Fig. 1, secured to the under sides of the cloth-frames, and thus impart at each revolution of the shaft D a violent agitation to said frames, shaking the dust from the cloths that has accumulated thereon. In thepresent instance I have only shown two inclined blocks or cams to each collecting-chamber; but it is evident they may be increased to any desired number that may be found expedient, in order to give the necessary agitation to the clothframes by the spring-knockers.

In order to effectually dislodge the dust from the dust-cloths it is necessary that the air be alternately shut off from the dustchambers,

dust-laden air from the bolts or millstones, the

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ing said blast to the lower chamber, A.

for the reason that if the cloth-frames in both chambers were all the time to be subjected to the blast the force of the blast would hold the particles of dust against the cloth, and in order to exclude the blast from one dust-chamber and allow the other chamber to continue separating the air from the dust I provide an automatic device constructed and arranged as follows:

Vithin the central air-passage, B, and at the discharge end of the aintrunk C, I place a cut-off valve, G. Said valve is rigidly secured to and moves with a rock shaft, g', mounted in suitable bearings. AfliXed to one extremity of said shaft g is a crank, 7L, pivoted to a pitman, t', the other end of said pitman being supported in a horizontal position by a pivoted arm, i', as shown, or by bearings of any suitable nature. The pitmanz' is provided with beveled recesses j j.

k indicates a gear-wheel mounted in suitable bearings and provided with a roller wristpin, k', said gear-wheel being so arranged with respect to the pitman i that the wrist-pin le will alternatelyT engage with the beveled slots j j in its rotation. Said gear-wheel k gears with a small gear-wheel, Z, which is mounted on a shaft carrying a beveled gear-wheel, m, several times larger than the gear-wheel Z, and the said beveled wheel m gears with a beveled wheel, a, mounted on the central shaft, D.

The cut-off valve is operated as follows:

The central shaft, D, being rotated as before.

described, communicates motion tothe wheel, 7s through the medium of the gearing above described, said wheel revolving at a very'slow rate of speed, and as the wrist-pin k enters and passes through the beveled slot j the pitman will be forced to the right,.drawing with it the crank h and depressing the valve, so as to cut off the air-blast from the lower dust-chamber and direct it to the upper chamber. rIhe rock-shaft g is provided at one extremitywith a weighted arm, g, (the weight not being showin) to balance said shaft andthe valve mounted thereon, so as to enable said valve to be turned with a small amount of power, and to maintain said valve in any position to which it may be turned. The knocker-arms F in their rotation strike the cams on the lower portions of the cloth-f'rames and dislodge the dust, and the air-blast being shut off from the lower chamber the dust descends by gravity to the lower part of the chamber, where it is swept off by the rotating sweepers E into the openings e, and is thence conveyed to the dust-receptacles.

Vhcn the wrist-pin reaches the beveled slot j, the pitman will be forced to the left, thus raising the cut-off valve, shutting oft' the airblast from the dust-chamber A,and discharg- The blast is thus automatically deflected from one to the other of the dust-chambers at regular intervals.

From the foregoing description it will be seen that the cloth-frames in both chambers Yare being continuously agitated, while the blast is alternately supplied and shut off from the same, for as long as the blast is on the frames will intercept and hold the dust, whether said frames are being agitated or at rest; but as soon as the blast is shut off from one of the chambers the dust therein will fall from the agitated frames and be swept off, as before described. It will thus be seen that one chamber is always collecting the dust while the other chamber is depositing the same from its cloths, there being no stoppage of the dust-collecting machinery.

It will be understood that the above-described dust-collecting machinery is applica ble to mills of every nature where dust is thrown off into the atmosphere by the machinery.

It will be readily observed by those skilled in the art to which my invention is especially designed that by my arrangement of one chamber above another, with a central air-passage common to both, as shown and described, I am enabled to operate the mechanism for vi- .brating the cloth-frames in said chambers, as

well as the mechanism for operating the valve that alternately shuts off the airblast to said chambers, from a single vertical shaft passing up through the central air-passage, thereby greatly simplifying the operating machinery, and also making the machine much more effectual in operation and adaptable to flour and other mills than in that class of machines where the air-chambers are arranged side by side and have' mechanism for operating a valve or valves to alternately shut off the airblast to said chambers and mechanism for keeping the dust-cloth or other frames clear.

Having thus described my invention, what I claim is l. In a dust-collector, the combination of two dustcollecting chambers arranged one above the other, as shown, and having a central air-passage common to both, an air-trunk discharging into said central air-passage, a vertical rotating shaft, a valve, and means for automatically operating the same to deflect the air-blast from one chamber and convey it to the other chamber, substantially as described.

2. The combination of two dust-collecting chambers arranged one above the other, and provided with cloth-frames,and having a central air-passage-common to both, an air-trunk discharging into said central air-passage, a vertical rotating shaft, a valve, means for automatically operating the same to alternately deflect the air-blast from one chamber and convey the same to the other chamber, and means for agitating the dust-cloths, substantially as shown and described.

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3. In a dust-collector, the combination of I and a vertical rotating shaft having knockers arranged to engage said frames to jar the accumulated dust from the cloths7 substantially as described.

5 4. In a dust-co11ector, the combination of two dust-collecting chambers, a central airpassage common to both, an air-trunk discharging into said central air-passage, avalve, and means for automatically operating the 1o same to deflect the air-blast from one chainber and convey it to the other, consisting of the rock-shaft, to which said valve is secured, crank, recessed pitman, gear-wheel having Wrist-pin, and means for operating said gear- Wheel, substantially as shown and described. i5

In testimony that I claim they foregoing I have hereunto set my hand this 26th day of March, 1884.

HENRY KEISER. Vitnesses:

THos. SLADE, S. R. GRIFFITH. 

